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std: Get the standard library compiling for wasm64

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This commit goes through and updates various `#[cfg]` as appropriate to
get the wasm64-unknown-unknown target behaving similarly to the
wasm32-unknown-unknown target. Most of this is just updating various
conditions for `target_arch = "wasm32"` to also account for `target_arch
= "wasm64"` where appropriate. This commit also lists `wasm64` as an
allow-listed architecture to not have the `restricted_std` feature
enabled, enabling experimentation with `-Z build-std` externally.

The main goal of this commit is to enable playing around with
`wasm64-unknown-unknown` externally via `-Z build-std` in a way that's
similar to the `wasm32-unknown-unknown` target. These targets are
effectively the same and only differ in their pointer size, but wasm64
is much newer and has much less ecosystem/library support so it'll still
take time to get wasm64 fully-fledged.
This commit is contained in:
Alex Crichton 2021-10-28 10:58:16 -07:00
parent 68ca579406
commit 7f3ffbc8c2
13 changed files with 41 additions and 22 deletions
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9
compiler/rustc_target/src/spec/wasm64_unknown_unknown.rs
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@ -23,11 +23,10 @@ pub fn target() -> Target {
// For now this target just never has an entry symbol no matter the output
// type, so unconditionally pass this.
clang_args.push("-Wl,--no-entry".to_string());
options
.pre_link_args
.get_mut(&LinkerFlavor::Lld(LldFlavor::Wasm))
.unwrap()
.push("--no-entry".to_string());
let lld_args = options.pre_link_args.get_mut(&LinkerFlavor::Lld(LldFlavor::Wasm)).unwrap();
lld_args.push("--no-entry".to_string());
lld_args.push("-mwasm64".to_string());
Target {
llvm_target: "wasm64-unknown-unknown".to_string(),